diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 74aa644cbb37b5741c521eba53d0a040aaf1582e..da5748bdaef376f35fdb49125e959474913c6ad9 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -282,6 +282,10 @@ static int try_difference(const char *arg)
 			struct commit *a, *b;
 			a = lookup_commit_reference(&oid);
 			b = lookup_commit_reference(&end);
+			if (!a || !b) {
+				*dotdot = '.';
+				return 0;
+			}
 			exclude = get_merge_bases(a, b);
 			while (exclude) {
 				struct commit *commit = pop_commit(&exclude);
@@ -328,12 +332,12 @@ static int try_parent_shorthands(const char *arg)
 		return 0;
 
 	*dotdot = 0;
-	if (get_oid_committish(arg, &oid)) {
+	if (get_oid_committish(arg, &oid) ||
+	    !(commit = lookup_commit_reference(&oid))) {
 		*dotdot = '^';
 		return 0;
 	}
 
-	commit = lookup_commit_reference(&oid);
 	if (exclude_parent &&
 	    exclude_parent > commit_list_count(commit->parents)) {
 		*dotdot = '^';
diff --git a/t/t6101-rev-parse-parents.sh b/t/t6101-rev-parse-parents.sh
index 8c617981a3a06c1ff49f03a2914bfdc31c0e293c..7683e4a1142a6ee31a1f1fd51b774b19fc2c7401 100755
--- a/t/t6101-rev-parse-parents.sh
+++ b/t/t6101-rev-parse-parents.sh
@@ -214,4 +214,12 @@ test_expect_success 'rev-list merge^-1x (garbage after ^-1)' '
 	test_must_fail git rev-list merge^-1x
 '
 
+test_expect_success 'rev-parse $garbage^@ does not segfault' '
+	test_must_fail git rev-parse $EMPTY_TREE^@
+'
+
+test_expect_success 'rev-parse $garbage...$garbage does not segfault' '
+	test_must_fail git rev-parse $EMPTY_TREE...$EMPTY_BLOB
+'
+
 test_done